Blue Dart Express — my important bank delivery is delayed by 6 days by blue dart

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201308

There is no point of calling customer care again and again. After explaining my situation several times the staff is really failing to meet expectations of customer.
I am waiting for my bank documents since 8 days, told them multiple times about my office hours. They can't provide delivery agent's no., they don't even send sms updates that my parcel is out for delivery.
Everyday i see updated status: no one found in premises delivery failed.
Today i have taken a day off to receive this important documents of mine. But no customer care executive is available to receive call and communicate to deliver this today.
Really poor service. Again i will reach bank and register a complaint against blue dart not delivering on time and giving poor customer experience. So that i future at least any of my documents are not sent via blue dart.